E.g. - Would you like 'anything else'?
- I'm sorry. I mistook you for 'somebody else'.
- 'Where else' did you go besides Madrid?
- 'What else' have you got to do?
- 'Whatever else' he may be, he's not a mathematician.
- We know when Shakespeare was born and when he died, but we don't know
'much else' about his life.

In a formal style, else is sometimes used after 'all'.
E.g. - When 'all else' fails, read the instructions.

2. other form
Else has a possessive form 'else’s'.
E.g. - You are wearing somebody 'else’s' coat.

3. structure
There is no plural structure with else.
E.g. - I didn't see 'any other' people. (NOT...any else people.)